Futaba GY401+S9257 AVCS Gyro with S9257 Standard Servo Set for Electric RC Helicopters  [GY401+S9257]

Futaba GY401 AVCS gyro paired with S9257 standard servo

The Futaba GY401 AVCS gyro together with the S9257 standard servo is supplied as a matched control unit intended for electric RC helicopters. The AVCS uses SMM sensor technology to reduce trim drift and maintain a stable heading, while the S9257 offers a compact standard-voltage servo output suitable for tail or small control surfaces.

The set is built for model use: the gyro houses sensor and control electronics in a conductive resin case to help reduce electromagnetic interference, and it supports remote gain adjustment and mode switching from a compatible transmitter. When a Futaba digital servo is fitted, the gyro can operate in DS mode to maintain high-speed response.

Installation notes: the gyro has a compact footprint with dedicated mounting pads to simplify placement inside typical electric RC helicopter fuselages, and the remote gain feature supports tuning on the field without removing the airframe. The S9257 follows standard wiring and voltage expectations for simple integration with Futaba receivers and tail linkages.

This Futaba GY401+S9257 combination is aimed at pilots who want a compact heading-hold gyro with remote tuning and a dependable standard servo for tail or control mounting; match wiring and gain to your airframe and transmitter capabilities.